Ah, yes. Z like Red, X like Yellow, and C like blue.
Apart from this odd choice of keys, this is pretty good. I like the concept a lot.
Thanks for playing our game :)
The only reason I suggested ZXC is over something like RYB is that the keys are physically a bit difficult to place your fingers on a keyboard. That would ruin the experience since it's extremely difficult to press those keys in quick succession compared to ZXC in a row.